【０００１】
【発明の属する技術分野】
本発明は、木質材へ樹脂を含浸させる方法に関する。さらに詳しくは、合板、化粧合板、無垢板材等の木質材に樹脂を含浸させ、ＷＰＣ処理を行う木質材の樹脂含浸方法に関する。
【０００２】
【従来の技術】
従来より、例えば、無垢板材等木材の寸法安定性、硬度、耐水性、耐吸湿性及び耐磨耗性等を改良するために、熱硬化性樹脂等からなる木材含浸処理用組成物を、木材に含浸させ、硬化させる方法が知られている。この方法によれば、木材の細胞内孔が樹脂で充填、あるいは細胞壁中のセルロース非晶領域が樹脂で膨潤された状態で固定され、水分の侵入が阻害されることにより、寸法安定性等が向上することが知られている。上記方法は、ＷＰＣ（Ｗｏｏｄ Ｐｌａｓｔｉｃ Ｃｏｍｂｉｎａｔｉｏｎ）処理として公知であり（例えば、特許文献１、２、３、４参照）、一般的に、溶剤系、水系の樹脂を用いて減圧・加圧して含浸させる方法や浸漬等の方法により、主として建築材料等の用途に利用されている。
【０００３】
【特許文献１】
特開平５−９６５１２号公報（第１−４頁、第１図）
【特許文献２】
特開昭６１−２９５００４号公報（第１−３頁）
【特許文献３】
特開昭６３−２９３００２号公報（第１−３頁、第１図）
【特許文献４】
特開平４−７３１０４号公報（第１−３頁）
【０００４】
【発明が解決しようとする課題】
しかしながら、上記した従来の樹脂含浸方法はバッチ処理であり、連続して木材を処理することができないため、生産性がよくないという問題がある。また、含浸処理用樹脂の歩留まりが悪いため、コスト的に不利であるとともに、含浸後に、上記含浸処理用樹脂に含まれる水や、揮発性成分を除去する必要があり、その際に反り、捻れ等の狂いが生じ易いという問題もある。本発明はこのような状況に鑑みてなされたものであり、生産性に優れ、かつ、含浸処理用樹脂の歩留まりをよくして、低コストで木質材に樹脂を含浸させることができるとともに、含浸処理後には、反り、捻れ等が生じることのない木質材の樹脂含浸方法を提供することを、その課題とする。
【０００５】
【課題を解決するための手段】
本発明は、上記課題を解決するために考え出されたものであって、つぎのような技術的手段を講じている。すなわち、本発明によれば、木質材へ樹脂を含浸させる方法であって、該木質材の内部空隙に含まれる空気を除く脱気処理と、該木質材に樹脂を含浸させる樹脂含浸処理とを連続的に行うことを特徴とする木質材の樹脂含浸方法が提供される。
【０００６】
一般的に、木質材の表面に単に樹脂を塗布したり、噴霧するだけでは木質材の内部空隙中に空気が存在するため、樹脂は上記空隙中に入り込み難く、含浸することが困難である。そこで、本発明においては、まず、上記空気を脱気処理する工程を設け、その後、引き続いて樹脂含浸処理を行う。このように、一連の工程で処理を行うことによって、生産性が向上し、かつ、樹脂が容易に含浸されるため、歩留まりをよくして、低コストで木質材に樹脂を含浸させることができる。
【０００７】
以下、図面を参照して詳細に説明する。図１は、上記脱気処理を減圧下に行い、減圧脱気工程終了後直ちにロールコーターにより樹脂を塗布して樹脂含浸処理を連続的に行う、本発明の第１の実施態様を示す説明図である。図２は、上記脱気処理を減圧下に行い、減圧脱気工程終了後直ちに減圧下スプレイコーターにより樹脂を噴霧して樹脂含浸処理を連続的に行う、第２の実施態様を示す説明図である。
【０００８】
図１において、処理される木質材１は、真空ポンプ等の減圧手段３により所定の減圧下、通常１〜１００トールの減圧に保たれた減圧室２に送入され、脱気処理を行う。減圧脱気を行うことにより、木質材１の内部空隙に含まれている空気が抜けるため、減圧脱気工程終了後直ちにロールコーター４で樹脂を塗布すれば、空気と入れ替わって樹脂が上記空隙に入り込むため、容易に樹脂含浸木質材１１を得ることができる。
【０００９】
図２においては、上記と同様にして、減圧脱気工程終了後直ちにスプレイコート用減圧室２１内で、減圧下スプレイコーター５により樹脂を噴霧して樹脂含浸処理が連続的に行われる。第２の実施態様においても、減圧脱気工程終了後直ちに、上記減圧下スプレイコーター５で樹脂が噴霧されるため、空気と入れ替わって樹脂が上記空隙に入り込り、容易に樹脂含浸木質材１１を得ることができる。また、第２の実施態様においては、平板のような二次元の形状のもののみならず、三次元の形状のものにも効率よく樹脂を含浸させることができる。
【００１０】
図３は、上記脱気処理を機械的圧縮により行い、圧縮脱気工程終了後直ちにロールコーターにより樹脂を塗布して樹脂含浸処理を行う、本発明の第３の実施態様を示す説明図である。図４は、上記脱気処理を機械的圧縮により行い、圧縮脱気工程終了後直ちに減圧下スプレイコーターにより樹脂を噴霧して樹脂含浸処理を連続的に行う、第４の実施態様を示す説明図である。
【００１１】
図３において、処理される木質材１は、ロールプレス等の加圧手段６により所定の圧力下、通常１〜２０ｋｇ／ｃｍ２の圧力で機械的に圧縮し、圧縮脱気処理を行う。ロールプレス６により、木質材１を機械的に圧縮すれば、木質材１の内部空隙も圧縮されて空隙内の空気が押し出され、圧縮された空隙が元の状態に戻ろうとする復元力が働くため、そのとき、直ちにロールコーター４で樹脂を塗布する。このようにすることにより、樹脂が空気と入れ替わって、木質材の内部空隙に入り込み、その結果、容易に樹脂を木質材に含浸させることができる。上記機械的に木質材を圧縮する工程においては、加温、あるいは水分の存在下に加温することにより、木質材の軟化が促進されて圧縮され易くなり、圧縮工程終了後の復元力も大きくなる。したがって、適当な温度、水分条件を選ぶことにより、さらに効率的に樹脂を木質材１に含浸させることができる。
【００１２】
図４において、木質材１は、ロールプレス６で圧縮脱気された後直ちにスプレイコート用減圧室２１でスプレイコーター５により減圧下、樹脂を噴霧して樹脂含浸処理を行う。上記と同様に、圧縮脱気工程終了後直ちに減圧下スプレイコーター５で樹脂を噴霧すれば、樹脂が空気と入れ替わって、木質材の内部空隙に入り込み、その結果、容易に樹脂を木質材に含浸させることができる。また、図４に示す第４の実施態様においては、平板のような二次元の形状のもののみならず、三次元の形状のものにも効率よく樹脂を含浸させることができる。
【００１３】
本発明において用いられる樹脂としては、熱、紫外線等により硬化する樹脂であればとくに限定されず、中でもユリア系、フェノール系、メラミン系、アクリル系、エポキシ系、ウレタン系樹脂及びその混合系が好ましく用いられ、水系、溶剤系、無溶剤系のいずれも使用可能である。しかしながら、水系、溶剤系の樹脂を用いた場合は、含浸処理後に水や溶剤等の揮発成分の除去が必要となるため、このような除去操作の不要な無溶剤系の樹脂を用いることが、さらに好ましい。このようにすることによって、反りや、捻れ等が生じることのない樹脂含浸木質材１１を得ることができる。さらに環境対応を考慮した場合も、無溶剤系の上記樹脂を用いることが好ましい。
【００１４】
本発明においては、上記のようにして樹脂を木質材１に含浸させた後、さらに樹脂の硬化工程を含んでもよい。すなわち、木質材１を減圧下に脱気処理し、減圧脱気工程終了後直ちにロールコーター４により樹脂を塗布して樹脂含浸木質材１１を得、引き続き樹脂硬化手段７によって該樹脂を硬化させ、ＷＰＣ処理を行って、ＷＰＣ処理木質材１２を製造してもよい。図５は、上記一連のフローを示す説明図である。
【００１５】
木質材１に含浸させた樹脂を硬化させるには種々の方法があり、例えば、樹脂組成物中に重合開始剤を配合して、熱や光によって硬化させることができる。熱により硬化させる場合には、熱重合開始剤を配合し、加熱炉、赤外線、マイクロ波等の加熱手段によって加熱し、硬化させる。光によって硬化させる場合には、光重合開始剤を増感剤とともに配合し、紫外線（ＵＶ）や可視光線を照射し、硬化させる。また、両者を併用することも可能であり、この場合は、加熱と光照射を同時に行う。このようにして、既述の木質材１に樹脂を含浸させる工程と、含浸された樹脂を硬化する工程を連続的に行うことにより、生産性が向上し、かつ、含浸処理用樹脂の歩留まりをよくして、低コストで、反りや捻れ等のないＷＰＣ処理木質材１２を得ることができる。
【００１６】
【実施例】
以下、実施例により、本発明にかかる木質材の樹脂含浸方法をさらに詳細に説明する。
【００１７】
【実施例１】
表側より順にオーク材単板（厚み０．２ｍｍ）、オーク材クロス単板（表面単板と繊維方向が直交する単板、厚み０．２ｍｍ）、ゴム集成材（厚み３０ｍｍ）を接着剤により貼着してなる積層体を供試体として用い、樹脂含浸処理を行った。すなわち、この供試体を図１に示すフローに準拠して、減圧脱気処理を行い、減圧脱気工程終了後直ちに、アクリル系樹脂（ＣＶＸ−２７５８、東亜合成（株）製）をロールコーターによって塗布した。引き続き、紫外線（ＵＶ）と加熱とを併用して硬化処理を行い、このようにして得られたＷＰＣ処理供試体の表面にフッ素塗装を施し、寸法安定性、表面硬度の評価を行った。得られた結果を表１に示す。
【００１８】
【実施例２】
実施例１におけるアクリル系樹脂を、ＣＶＸ−２７５８に代えて、ＣＵＸ−１７９（東亜合成（株）製）とした以外は実施例１と同じ条件で樹脂含浸処理を行い、紫外線（ＵＶ）と加熱とを併用して硬化処理を行った。得られたＷＰＣ処理供試体の表面にフッ素塗装を施し、寸法安定性、表面硬度の評価を行った。得られた結果を表１に示す。
【００１９】
【比較例１】
表側より順にオーク材単板（厚み０．２ｍｍ）、オーク材クロス単板（表面単板と繊維方向が直交する単板、厚み０．２ｍｍ）、ゴム集成材（厚み３０ｍｍ）を接着剤により貼着してなる積層体を供試体として用い、従来法により樹脂含浸処理を行った。すなわち、この供試体に公知の減圧・加圧樹脂浸漬法を適用し、アクリル系樹脂（ＣＶＸ−２７５８、東亜合成（株）製）を含浸させた。引き続き、紫外線（ＵＶ）と加熱とを併用して硬化処理を行い、このようにして得られたＷＰＣ処理供試体の表面にフッ素塗装を施し、寸法安定性、表面硬度の評価を行った。得られた結果を実施例１、２の結果と併せて表１に示す。
【００２０】
【表１】
【００２１】
表１の結果から、実施例１、２における樹脂含浸率は４０％であり、従来法による比較例１の樹脂含浸率が５０％であるのに比べて、１０％も少なくなっていることが明らかである。一方、寸法安定性は、両者とも顕著な差はみられず、いずれも優れているため、本発明の方法を実施すれば、従来法よりも少ない樹脂の使用量で、ほぼ、同等の効果が得られることが明らかである。
【００２２】
【発明の効果】
以上述べたように、請求項１に記載の発明は、上記のように構成され、とくに、予め木質材の内部空隙に含まれる空気を除く脱気処理を行い、その後、引き続いて樹脂含浸処理を行う。このように、一連の工程で処理することによって、生産性が向上し、かつ、含浸処理用樹脂の歩留まりをよくして、低コストで木質材に樹脂を含浸させることができる。
【００２３】
請求項２に記載の発明は、上記脱気処理を減圧下に行い、減圧脱気工程終了後直ちにロールコーター４により樹脂を塗布して樹脂含浸処理を行う。減圧脱気を行うことにより、木質材１の内部空隙に含まれている空気と入れ替わって樹脂が上記空隙に入り込むため、請求項１に記載の発明の効果に加えて、容易に木質材１に樹脂を含浸させることができる。
【００２４】
請求項３に記載の発明は、上記脱気処理を減圧下に行い、減圧脱気工程終了後直ちに減圧下スプレイコーター５により樹脂を噴霧して樹脂含浸処理を行う。減圧脱気を行うことにより、木質材１の内部空隙に含まれている空気と入れ替わって樹脂が上記空隙に入り込むため、請求項１に記載の発明の効果に加えて、容易に木質材１に樹脂を含浸させることができる。
【００２５】
請求項４に記載の発明は、上記脱気処理を機械的圧縮により行い、圧縮脱気工程終了後直ちにロールコーター４により樹脂を塗布して樹脂含浸処理を行う。このようにすることにより、請求項１に記載の発明の効果に加えて、樹脂が空気と入れ替わって、木質材１の内部空隙に入り込み、その結果、容易に樹脂を木質材１に含浸させることができる。
【００２６】
請求項５に記載の発明は、上記脱気処理を機械的圧縮により行い、圧縮脱気工程終了後直ちに減圧下スプレイコーター５により樹脂を噴霧して樹脂含浸処理を行う。圧縮脱気工程終了後直ちに減圧下スプレイコーター５で樹脂を噴霧すれば、請求項１に記載の発明の効果に加えて、樹脂が空気と入れ替わって、木質材１の内部空隙に入り込み、その結果、容易に樹脂を木質材１に含浸させることができる。
【００２７】
請求項６に記載の発明は、上記木質材１に樹脂を含浸させた後、該樹脂の硬化工程をさらに含む。このようにすることにより、請求項１に記載の発明の効果に加えて、樹脂含浸工程と、樹脂硬化工程とを連続的に行うことにより、生産性が向上し、かつ、含浸処理用樹脂の歩留まりをよくして、低コストで木質材１にＷＰＣ処理をすることができる。
【図面の簡単な説明】
【図１】本発明にかかる木質材の樹脂含浸方法の第１態様を示す説明図である。
【図２】本発明にかかる木質材の樹脂含浸方法の第２態様を示す説明図である。
【図３】本発明にかかる木質材の樹脂含浸方法の第３態様を示す説明図である。
【図４】本発明にかかる木質材の樹脂含浸方法の第４態様を示す説明図である。
【図５】樹脂含浸工程と樹脂硬化工程を連続的に行うフローを示す説明図である。
【符号の説明】
１ 木質材
１１ 樹脂含浸木質材
１２ ＷＰＣ処理木質材
２ 減圧室
２１ スプレイコート用減圧室
３ 減圧手段
４ ロールコーター
５ スプレイコーター
６ ロールプレス
７ 樹脂硬化手段[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for impregnating a wood material with a resin. More specifically, the present invention relates to a method of impregnating a wood material such as a plywood, a decorative plywood, and a solid plywood with a resin, and performing a WPC process on the resin.
[0002]
[Prior art]
Conventionally, for example, in order to improve the dimensional stability, hardness, water resistance, moisture absorption resistance, abrasion resistance, etc. of wood such as solid board materials, a wood impregnation treatment composition comprising a thermosetting resin or the like is used. There is known a method of impregnating and curing. According to this method, the intracellular pores of the wood are filled with a resin, or the amorphous cellulose region in the cell wall is fixed in a state of being swollen with the resin, and the penetration of water is inhibited, so that dimensional stability and the like are improved. It is known to improve. The above method is known as WPC (Wood Plastic Combination) treatment (see, for example, Patent Documents 1, 2, 3, and 4), and is generally impregnated by using a solvent-based or water-based resin under reduced pressure and pressure. It is mainly used for applications such as building materials by methods such as immersion and immersion.
[0003]
[Patent Document 1]
JP-A-5-96512 (pages 1-4, FIG. 1)
[Patent Document 2]
JP-A-61-295004 (pages 1-3)
[Patent Document 3]
JP-A-63-293002 (pages 1-3, FIG. 1)
[Patent Document 4]
JP-A-4-73104 (pages 1-3)
[0004]
[Problems to be solved by the invention]
However, the above-described conventional resin impregnation method is a batch process, and cannot continuously process wood, so that there is a problem that productivity is poor. In addition, since the yield of the impregnating resin is low, it is disadvantageous in terms of cost, and it is necessary to remove water and volatile components contained in the impregnating resin after the impregnation. There is also a problem that such deviations easily occur. The present invention has been made in view of such circumstances, has excellent productivity, and can improve the yield of the resin for impregnation treatment, and can impregnate the wood material with the resin at low cost. It is an object of the present invention to provide a method of impregnating a wood material with a resin that does not cause warping, twisting, or the like after the treatment.
[0005]
[Means for Solving the Problems]
The present invention has been conceived in order to solve the above problems, and employs the following technical means. That is, according to the present invention, there is provided a method for impregnating a wood material with a resin, comprising a deaeration treatment for removing air contained in internal voids of the wood material and a resin impregnation treatment for impregnating the wood material with a resin. A method for impregnating a wood material with a resin, which is performed continuously, is provided.
[0006]
In general, simply applying or spraying a resin on the surface of a wooden material causes air to be present in the internal space of the wooden material, so that it is difficult for the resin to enter the space and impregnate the resin. Therefore, in the present invention, first, a step of degassing the air is provided, and subsequently, a resin impregnation process is performed subsequently. As described above, by performing the treatment in a series of steps, the productivity is improved, and the resin is easily impregnated. Therefore, the yield can be improved, and the wood material can be impregnated with the resin at low cost. .
[0007]
Hereinafter, this will be described in detail with reference to the drawings. FIG. 1 is an explanatory view showing a first embodiment of the present invention, in which the above-described deaeration is performed under reduced pressure, and immediately after completion of the reduced-pressure deaeration step, a resin is applied by a roll coater to continuously perform resin impregnation. It is. FIG. 2 is an explanatory view showing a second embodiment in which the degassing treatment is performed under reduced pressure and the resin impregnation treatment is continuously performed by spraying the resin with a spray coater under reduced pressure immediately after the completion of the reduced pressure deaeration step. is there.
[0008]
In FIG. 1, a wood material 1 to be treated is sent to a decompression chamber 2 kept at a predetermined pressure, usually 1 to 100 torr, by a decompression means 3 such as a vacuum pump, and deaerated. Since the air contained in the internal space of the wooden material 1 escapes by performing the decompression and deaeration, if the resin is applied by the roll coater 4 immediately after the completion of the decompression and deaeration step, the resin is replaced with the air and the resin enters the space. Since it enters, the resin-impregnated wooden material 11 can be easily obtained.
[0009]
In FIG. 2, in the same manner as described above, the resin impregnation process is continuously performed by spraying the resin with the spray coater 5 under reduced pressure in the spray coat vacuum chamber 21 immediately after the completion of the vacuum degassing step. Also in the second embodiment, the resin is sprayed by the spray coater 5 under the reduced pressure immediately after the completion of the reduced-pressure deaeration step. Can be obtained. In the second embodiment, not only a two-dimensional shape such as a flat plate but also a three-dimensional shape can be efficiently impregnated with resin.
[0010]
FIG. 3 is an explanatory view showing a third embodiment of the present invention, in which the deaeration is performed by mechanical compression, and immediately after completion of the compression deaeration step, a resin is applied by a roll coater to perform a resin impregnation. . FIG. 4 is an explanatory view showing a fourth embodiment in which the deaeration is performed by mechanical compression, and immediately after completion of the compression deaeration step, the resin is sprayed with a spray coater under reduced pressure to continuously perform the resin impregnation. It is.
[0011]
In FIG. 3, the wood material 1 to be processed is mechanically compressed by a pressurizing means 6 such as a roll press under a predetermined pressure, usually at a pressure of 1 to 20 kg / cm 2 to perform a compression deaeration treatment. When the wooden material 1 is mechanically compressed by the roll press 6, the internal space of the wooden material 1 is also compressed, and the air in the space is extruded, and a restoring force acts to return the compressed space to the original state. Therefore, at that time, the resin is immediately applied by the roll coater 4. By doing so, the resin replaces the air and enters the internal space of the wood material, and as a result, the wood material can be easily impregnated with the resin. In the step of mechanically compressing the wood material, by heating or heating in the presence of moisture, the softening of the wood material is promoted and the wood material is easily compressed, and the restoring force after the end of the compression process is also increased. . Therefore, by selecting appropriate temperature and moisture conditions, the wood material 1 can be more efficiently impregnated with the resin.
[0012]
In FIG. 4, the wood material 1 is compressed and degassed by the roll press 6 and immediately after the resin is sprayed under reduced pressure by the spray coater 5 in the spray coat decompression chamber 21 to perform the resin impregnation process. Similarly to the above, if the resin is sprayed with the spray coater 5 under reduced pressure immediately after the completion of the compression / deaeration step, the resin is replaced with air and enters the internal space of the wood material, and as a result, the wood material is easily impregnated with the resin. Can be done. Further, in the fourth embodiment shown in FIG. 4, not only a two-dimensional shape such as a flat plate but also a three-dimensional shape can be impregnated with resin efficiently.
[0013]
The resin used in the present invention is not particularly limited as long as it is a resin that can be cured by heat, ultraviolet light, etc., and among them, urea-based, phenol-based, melamine-based, acrylic, epoxy-based, urethane-based resins and mixed systems thereof are preferable. It is used, and any of an aqueous system, a solvent system, and a non-solvent system can be used. However, in the case of using a water-based or solvent-based resin, it is necessary to remove volatile components such as water and a solvent after the impregnation treatment. More preferred. By doing so, it is possible to obtain the resin-impregnated wood material 11 free from warpage, twisting, and the like. Further, in consideration of environmental friendliness, it is preferable to use the solventless resin.
[0014]
In the present invention, after the wood material 1 is impregnated with the resin as described above, a resin curing step may be further included. That is, the wood material 1 is degassed under reduced pressure, and immediately after completion of the vacuum degassing step, a resin is applied by a roll coater 4 to obtain a resin-impregnated wood material 11, which is subsequently cured by a resin curing means 7, The WPC process may be performed to manufacture the WPC-processed wood 12. FIG. 5 is an explanatory diagram showing the above series of flows.
[0015]
There are various methods for curing the resin impregnated in the wood material 1. For example, a polymerization initiator may be blended in the resin composition and cured by heat or light. In the case of curing by heat, a thermal polymerization initiator is blended, and the mixture is heated and cured by a heating means such as a heating furnace, infrared rays, or microwaves. In the case of curing by light, a photopolymerization initiator is blended together with a sensitizer, and the composition is cured by irradiation with ultraviolet (UV) or visible light. It is also possible to use both in combination, in which case heating and light irradiation are performed simultaneously. In this way, by continuously performing the step of impregnating the wood material 1 with the resin and the step of curing the impregnated resin, the productivity is improved and the yield of the resin for impregnation treatment is improved. It is possible to obtain a low-cost WPC-treated wood 12 without warpage or twisting.
[0016]
【Example】
Hereinafter, the method for impregnating a wood material with a resin according to the present invention will be described in more detail with reference to examples.
[0017]
Embodiment 1
From the front side, veneer veneer (thickness 0.2 mm), veneer oak cloth veneer (veneer whose surface and veneer are perpendicular to each other, veneer 0.2 mm in thickness), and rubber laminated material (thickness 30 mm) are stuck with adhesive. The resin-impregnated treatment was performed using the laminated body as a specimen. That is, this specimen was subjected to a vacuum degassing treatment in accordance with the flow shown in FIG. 1, and immediately after completion of the vacuum degassing step, an acrylic resin (CVX-2758, manufactured by Toa Gosei Co., Ltd.) was roll-coated with a roll coater. Applied. Subsequently, a curing treatment was carried out using both ultraviolet light (UV) and heating, and the surface of the WPC-treated specimen thus obtained was subjected to fluorine coating, and dimensional stability and surface hardness were evaluated. Table 1 shows the obtained results.
[0018]
Embodiment 2
The resin impregnation treatment was performed under the same conditions as in Example 1 except that the acrylic resin in Example 1 was changed to CUX-179 (manufactured by Toagosei Co., Ltd.) instead of CVX-2758, and was heated with ultraviolet rays (UV). And a curing treatment was performed. Fluorine coating was applied to the surface of the obtained WPC-treated specimen, and dimensional stability and surface hardness were evaluated. Table 1 shows the obtained results.
[0019]
[Comparative Example 1]
From the front side, veneer veneer (thickness 0.2 mm), veneer oak cloth veneer (veneer whose surface and veneer are perpendicular to each other, veneer 0.2 mm in thickness), and rubber laminated material (thickness 30 mm) are stuck with adhesive. Using the laminated body as a specimen, resin impregnation was performed by a conventional method. That is, a known depressurized / pressurized resin dipping method was applied to this specimen to impregnate an acrylic resin (CVX-2758, manufactured by Toagosei Co., Ltd.). Subsequently, a curing treatment was carried out using both ultraviolet light (UV) and heating, and the surface of the WPC-treated specimen thus obtained was subjected to fluorine coating, and dimensional stability and surface hardness were evaluated. Table 1 shows the obtained results together with the results of Examples 1 and 2.
[0020]
[Table 1]
[0021]
From the results in Table 1, the resin impregnation rate in Examples 1 and 2 is 40%, which is 10% less than the resin impregnation rate of Comparative Example 1 according to the conventional method of 50%. it is obvious. On the other hand, the dimensional stability does not show a remarkable difference between the two, and both are excellent.Thus, if the method of the present invention is carried out, almost the same effect can be obtained with a smaller amount of resin than the conventional method. It is clear that it can be obtained.
[0022]
【The invention's effect】
As described above, the invention according to claim 1 is configured as described above, and in particular, performs a deaeration process for removing air contained in the internal voids of the wooden material in advance, and then performs a resin impregnation process subsequently. Do. As described above, by performing the treatment in a series of steps, the productivity can be improved, the yield of the resin for impregnation treatment can be improved, and the wood material can be impregnated with the resin at low cost.
[0023]
According to the second aspect of the present invention, the deaeration treatment is performed under reduced pressure, and the resin is applied by a roll coater 4 immediately after the completion of the decompression deaeration step to perform the resin impregnation treatment. By performing decompression and degassing, the resin enters the voids instead of the air contained in the internal voids of the wooden material 1. A resin can be impregnated.
[0024]
According to a third aspect of the present invention, the deaeration is performed under reduced pressure, and the resin is impregnated by spraying the resin with the spray coater 5 under reduced pressure immediately after the completion of the deaeration step. By performing decompression and degassing, the resin enters the voids instead of the air contained in the internal voids of the wooden material 1. A resin can be impregnated.
[0025]
According to a fourth aspect of the present invention, the deaeration is performed by mechanical compression, and the resin is applied by a roll coater 4 immediately after the compression and deaeration step, and the resin is impregnated. By doing so, in addition to the effect of the first aspect of the present invention, the resin is replaced with air and enters the internal space of the wooden material 1, and as a result, the resin is easily impregnated into the wooden material 1. Can be.
[0026]
According to a fifth aspect of the present invention, the deaeration is performed by mechanical compression, and the resin is sprayed with the spray coater 5 under reduced pressure immediately after the compression and deaeration step to perform the resin impregnation. If the resin is sprayed with the spray coater 5 under reduced pressure immediately after the completion of the compression deaeration step, in addition to the effect of the invention according to claim 1, the resin is replaced with air and enters the internal space of the wood material 1, and as a result, Thus, the wood material 1 can be easily impregnated with the resin.
[0027]
The invention according to claim 6 further includes, after impregnating the wood material 1 with a resin, a curing step of the resin. By doing so, in addition to the effect of the invention of claim 1, by continuously performing the resin impregnation step and the resin curing step, the productivity is improved, and the resin for the impregnation treatment is improved. The yield can be improved, and the WPC process can be performed on the wooden material 1 at low cost.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a first embodiment of a method for impregnating a wood material with a resin according to the present invention.
FIG. 2 is an explanatory view showing a second embodiment of the method for impregnating a wood material with a resin according to the present invention.
FIG. 3 is an explanatory view showing a third embodiment of the method for impregnating a wood material with a resin according to the present invention.
FIG. 4 is an explanatory view showing a fourth embodiment of the method for impregnating a wood material with a resin according to the present invention.
FIG. 5 is an explanatory diagram showing a flow in which a resin impregnation step and a resin curing step are performed continuously.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 wood material 11 resin-impregnated wood material 12 WPC-treated wood material 2 decompression chamber 21 decompression chamber for spray coat 3 decompression means 4 roll coater 5 spray coater 6 roll press 7 resin curing means
